Journal
ENVIRONMENTAL POLLUTION
Volume 157, Issue 4, Pages 1352-1359Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.11.039
Keywords
Fulvic acids; Dissolved organic matters; Polycyclic aromatic hydrocarbons (PAHs); Photodegradation; Singlet oxygen; Hydroxyl radical
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Funding
- National Natural Science Foundation of China [40571138, 40201046]
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With an Xe arc lamp house as simulated sunlight, the influences of fulvic acid (FA) concentration and origins on photodegradation of acenaphthene, fluorine, phenanthrene, fluoranthene and pyrene in aqueous solution have been studied. Similar effects of FAs, collected from five places around China, on polycyclic aromatic hydrocarbon (PAH) photodegradation have been observed. Active oxygen was of significance in PAH photodegradation with the presence of FAs. For systems with 1.25 mg L(-1) FAs, the contributions of (center dot)OH to PAH photodegradation rates were from 33% to 69%. FAs had two opposite effects, i.e., stimulating the generation of active oxygen and advancing PAH photodegradation; competing with PAHs for energy and photons and restraining PAH photodegradation. Generally, photodegradation rates of the 5 PAHs decreased with the increase of FAs concentration; except fluoranthene and pyrene were advanced in solutions with low FA concentration. The influences of FA concentration on PAH photodegradation were more significant than FA origin. (C) 2008 Elsevier Ltd. All rights reserved.
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